Discussion
Assertion (A): Assertion: A common-emitter stage's voltage gain does not depend on beta.
Reason (R): Reason: The gain is the transconductance times the load, and transconductance depends only on the collector current.
Select the correct answer from the options below.
Answer: A
Both are true and the second is the reason: beta appears nowhere in the gain expression, which is why gain is far more predictable than input impedance. Beta does affect how much drive current the stage needs and how heavily it loads its source, but not the voltage ratio itself. Knowing which specifications inherit the unreliable parameter and which do not is what makes a data sheet's spread tolerable. The shared properties explain why these schemes form a family, and the differences explain why more than one exists.
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